Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1679 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Scan Tool Output Controls
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM)
| Scan Tool Output Control | Additional Menu Selection | Description |
|---|---|---|
| Auto. Headlamp Control | Lamp Test | The body control module (BCM) actuates the headlamps when you select ON. |
| Auto. Parklamp Control | Lamp Test | The BCM actuates the ALC park lamp relay when you select ON. |
| Daytime Running Lamps | Lamp Test | The BCM actuates the DRL relay when you select ON. |
| Interior Lamps | Lamp Test | The BCM actuates the interior lamp control for when you select ON. |
| I/P Illumination Lamps | Lamp Test | The BCM actuates the I/P lamps at the requested intensity when you select ON. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.